• Title/Summary/Keyword: Slurry ice

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Characteristics of Drag Reduction Additives in the Application of District Cooling System (지역냉방시스템에의 적용을 위한 마찰저항감소 첨가물 특성 연구)

  • 윤석만;김종보
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.12 no.3
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    • pp.251-257
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    • 2000

  • District heating and cooling systems offer highly efficient energy utilization and maintenance by centralizing heat management. More pumping power, however, is required because the water has to travel long distance from heat source to the users. In the present study, a trace of drag reduction additives is added to the District Cooling system to achieve a significant drag reduction and save pumping power. Water-soluble polymers, surfactants, and environment-friendly degradable polymers are used as effective drag reducing additives. Time dependent percent drag reductions are compared for various additive solutions at 100 wppm concentration for different water velocity. Without as an anionic surfactant, copolymer was most effective in percent drag reduction. It is found that there exists an optimal condition when copolymer is mixed with SDS. An environment-friendly degradable polymer, xanthan gum, is found to be a significant drag reduction additive. Ice slurry systems, can give less pressure drops compared with chilled water system for certain condtions. Drag reduction additives were also effective for the ice slurry system.

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Influence of Velocity on Pressure Drop of Flowing Ice Slurry in Elbow and its continued Inclined Tube (곡관과 연속된 경사관 내에서 유동하는 아이스슬러리의 압력손실에 미치는 유속의 영향)

  • Park Ki-Won;Kim Kyu-Mok
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.7
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    • pp.635-641
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    • 2005

  • This study experimented to understand the effects of transporting ice slurry through elbow and inclined tube. And at this experiment it used propylene glycol-water solution and a diameter of about 2mm ice particle. The experiments were carried out under various conditions, with velocity of water solution at the entry ranging from 1.0 to 3.5 w/s and elbows and inclined tubes of 4 kinds angle with $30^{\circ},\;45^{\circ},\;90^{\circ}\;and\;180^{\circ}$. The pressure drop between the tube entry and exit were measured. According to angle of bending, the highest pressure drop was measured at $30^{\circ}$ elbow and the lowest pressure drop was measured at $90^{\circ}$ elbow, and there are only a little differences of pressure drop between $45^{\circ}$ elbow and $180^{\circ}$ elbow. According to angle of inclined tube, the highest pressure drop was measured at $90^{\circ}$ inclined tube and the pressure drop at $45^{\circ},\;30^{\circ},\;180^{\circ}$ inclined tubes were lower successively. The lowest pressure drop in elbows and inclined tubes was measured at velocity of $2.0\~2.5$ m/s and concentration of $10\;wt\%$.

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Quantity of Ice Slurry in Cooled Tube by Continuous Ice Making using Organic Water Solution (유기수용액에 의한 냉각관내 연속제빙시의 제빙량)

  • ;Hidetoshi Miura;Akihiko Horibe;Hideo Inaba
    • Journal of Energy Engineering
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    • v.9 no.3
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    • pp.221-227
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    • 2000

  • 본 논문은 냉각된 원관내에서 유동하는 프로필렌글리콜 수용액의 제빙에 관하여 실험한 것이다. 실험은 수용액의 질량농도, 수용액의 유속, 관벽의 온도, 펌프의 압력 등을 변화시키면서 행하였다. 그 결과 관내에서의 제빙량은 프로필렌글리콜 수용액의 관내유속, 벽면과 냉각도 및 수용액의 농도에 영향을 받고 있었고, 수용액의 질량농도가 낮을수록 또 시험수용액의 유속이 빠를수록 관내에서의 제빙량은 증가하는 경향을 띄었다. 그리고 관내제빙율에 영향을 미치는 인자들의 효과를 검토하여 관내제빙율에 관한 우차원식을 얻었다.

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